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SDM-SW8A Switch Closure Input Module
2. Specifications
Operating voltage: 12 VDC nominal (9.6 to 16)
Current drain: 3 mA quiescent, 6 mA active (max)
Environmental: -25 to +50
o
C, 0 to 90% RH,
noncondensing
Measurement types: Switch closure (SPDT, SPST) DC voltage
pulse
Input voltage threshold: From below 0.9 to above 4.0 VDC,±20
VDC max
Maximum input frequency: 100 Hz (50% duty cycle)
Minimum input pulse width: 5 ms high, 5 ms low
Maximum bounce time: 3 ms open without counting
Output options: State, duty cycle, counts
Max count/port: 65535
Internal sampling frequency: 500 Hz
Watchdog reset: Yes
Total length of connecting cables: 20 feet
Dimensions: 0.9"(H), 6.2"(L), 2.7"(W)
Weight 0.5 lbs. (0.23 kg)
Compatible dataloggers: CR10(X), CR800, CR850, CR1000, 21X,
CR23X, CR3000, CR5000, and CR7
TABLE 1. Datalogger to SDM-SW8A Connections
Datalogger
SDM-SW8A
CR7
CR1000,
CR800,
CR850,
CR23X,
CR10(X)
CR3000,
CR5000
21X
+12
(see Note 1)
+12 12 V 12 V +12
G G
C3 C3 C3 SDM-C3 C3
C2 C2 C2 SDM-C2 C2
C1 IN C1 C1 SDM-C1 C1
C1 OUT not used
(see Note 2)
not used
(see Note 2)
not used
(see Note 2)
1H
(see Note 2)
2